JP2019065808A - Intake system structure for internal combustion engine - Google Patents

Intake system structure for internal combustion engine Download PDF

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JP2019065808A
JP2019065808A JP2017194036A JP2017194036A JP2019065808A JP 2019065808 A JP2019065808 A JP 2019065808A JP 2017194036 A JP2017194036 A JP 2017194036A JP 2017194036 A JP2017194036 A JP 2017194036A JP 2019065808 A JP2019065808 A JP 2019065808A
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intake
intake air
mixing
internal combustion
unit
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裕一郎 小田
Yuichiro Oda
裕一郎 小田
児玉　裕
Yutaka Kodama
裕 児玉
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Isuzu Motors Ltd
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Isuzu Motors Ltd
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Abstract

To effectively promote mixing of fresh air and EGR gas.SOLUTION: An intake system structure for an internal combustion engine includes: a recirculation exhaust gas recirculation section 22 for introducing recirculation exhaust gas recirculated from an exhaust system of the internal combustion engine E; an intake air mixing section 23 extended from a downstream end of the recirculation exhaust gas recirculation section 22 and mixing fresh air and the recirculation exhaust gas; an intake air distribution section 25 for distributing the intake air mixed by the intake air mixing section 23 to intake ports 12A, B; and a partition wall section 28 extended at an adjacent portion between the intake air mixing section 23 and the intake air distribution section 25 for partitioning of the intake air mixing section 23 and the intake air distribution section 25.SELECTED DRAWING: Figure 2

Description

本開示の技術は、内燃機関の吸気系構造に関し、特に、吸気マニホールドの吸気流路構造に関する。   The technology of the present disclosure relates to an intake system structure of an internal combustion engine, and more particularly to an intake channel structure of an intake manifold.

従来、内燃機関においては、排気ガスの少なくとも一部を吸気系に再循環させる排気再循環装置（Exhaust Gas Recirculation System：以下、ＥＧＲ装置）が広く実用化されている。この種のＥＧＲ装置は、例えば、特許文献１等に開示されている。当該文献に開示されたＥＧＲ装置は、ＥＧＲ配管を過給機のコンプレッサよりも下流側の吸気系（例えば、吸気マニホールド）に合流させた所謂高圧ＥＧＲ装置である。   BACKGROUND Conventionally, in an internal combustion engine, an exhaust gas recirculation system (hereinafter referred to as an EGR system) for recirculating at least a part of exhaust gas to an intake system has been widely put to practical use. An EGR device of this type is disclosed, for example, in Patent Document 1 and the like. The EGR device disclosed in the document is a so-called high pressure EGR device in which an EGR pipe is joined to an intake system (for example, an intake manifold) on the downstream side of a compressor of a turbocharger.

特開２０１７−１２５４４７号公報JP 2017-125447 A

高圧ＥＧＲ装置において、ＥＧＲ配管を吸気マニホールドに合流させると、吸気マニホールド内にＥＧＲガスを導入するＥＧＲ還流部と、吸気を各吸気ポートに分配する吸気分配部との距離が短くなる。これらＥＧＲ還流部と吸気分配部との距離が短くなると、ＥＧＲガスが新気と十分に混合されることなく吸気分配部に流れ込む場合がある。   In the high pressure EGR device, when the EGR pipe is joined to the intake manifold, the distance between the EGR recirculation unit for introducing the EGR gas into the intake manifold and the intake distribution unit for distributing the intake to each intake port becomes short. When the distance between the EGR recirculation unit and the intake air distribution unit becomes short, the EGR gas may flow into the intake air distribution unit without being sufficiently mixed with the fresh air.

各気筒にＥＧＲガスと新気との混合が不十分な状態の吸気が供給されると、ＥＧＲガス濃度が過剰に高い気筒では失火を生じたり、酸素濃度が過剰に高い気筒では燃焼温度の上昇によりノッキングを生じたりするといった課題がある。このような現象は、特に、天然ガスを燃料とするエンジンにて生じやすい傾向がある。   If intake air with insufficient mixing of EGR gas and fresh air is supplied to each cylinder, a misfire occurs in a cylinder where the EGR gas concentration is excessively high, or the combustion temperature rises in a cylinder where the oxygen concentration is excessively high. There is a problem that knocking occurs due to Such a phenomenon tends to occur particularly in an engine fueled with natural gas.

本開示の技術は、内燃機関の吸気系構造において、新気とＥＧＲガスとの混合を効果的に促進することを目的とする。   The technique of the present disclosure aims to effectively promote mixing of fresh air and EGR gas in an intake system structure of an internal combustion engine.

本開示の技術は、内燃機関の排気系から還流される再循環排気を導入する再循環排気還流部と、前記再循環排気還流部の下流端から延びると共に、新気と前記再循環排気とを混合させる吸気混合部と、少なくともその一部を前記吸気混合部に隣接させると共に、前記吸気混合部にて混合された吸気を前記内燃機関のシリンダヘッドに形成された吸気ポートに分配する吸気分配部と、前記吸気混合部と前記吸気分配部との隣接部位に延設されて、前記吸気混合部と前記吸気分配部とを仕切る仕切壁部と、を備えることを特徴とする。   The technology of the present disclosure extends from a downstream end of the recirculated exhaust gas recirculation unit to a recirculated exhaust gas recirculation unit that introduces recirculated exhaust gas that is recirculated from the exhaust system of the internal combustion engine, and extends fresh air and the recirculated exhaust gas. An intake air mixing portion to be mixed, and an intake air distribution portion for making at least a part thereof adjacent to the intake air mixing portion and distributing the intake air mixed in the intake air mixing portion to an intake port formed in a cylinder head of the internal combustion engine And a partition wall portion extended in an adjacent part of the intake air mixing portion and the intake air distribution portion to separate the intake air mixing portion and the intake air distribution portion.

また、前記吸気混合部の下流端と前記吸気分配部の上流端とを接続して前記吸気混合部から流れ込む吸気を前記吸気分配部に向けて折り返す吸気折り返し部をさらに備えることが好ましい。   Further, it is preferable to further include an intake turn-around portion that connects the downstream end of the intake mixing portion and the upstream end of the intake distribution portion and turns back the intake air flowing from the intake mixing portion toward the intake distribution portion.

また、前記再循環排気還流部、前記吸気混合部、前記吸気分配部、前記仕切壁部及び、前記吸気折り返し部が一体に形成された吸気マニホールドであってもよい。   The air intake manifold may be one in which the recirculation exhaust gas recirculation unit, the intake air mixing unit, the intake air distribution unit, the partition wall, and the intake air return unit are integrally formed.

また、前記吸気折り返し部の下流端側に、前記吸気分配部よりも前記シリンダヘッド側に円弧状に凸となるように湾曲する湾曲部が設けられてもよい。   Further, a curved portion may be provided on the downstream end side of the intake air return portion so as to be convex in a circular arc shape closer to the cylinder head than the intake distribution portion.

また、前記吸気折り返し部の前記湾曲部よりも下流側に、前記湾曲部と前記吸気分配部の上流端との間に所定の距離を確保する直線状部が設けられてもよい。   Further, a linear portion may be provided on the downstream side of the curved portion of the intake air-folded portion to secure a predetermined distance between the curved portion and the upstream end of the intake air distribution portion.

本開示の技術によれば、新気とＥＧＲガスとの混合を効果的に促進することができる。   According to the technology of the present disclosure, mixing of fresh air and EGR gas can be effectively promoted.

本実施形態に係る内燃機関の吸排気系を示す模式的な全体構成図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a typical whole block diagram which shows the intake and exhaust system of the internal combustion engine which concerns on this embodiment. 本実施形態に係る吸気系構造の要部を示す模式図である。It is a schematic diagram which shows the principal part of the intake system structure which concerns on this embodiment.

以下、添付図面に基づいて、本実施形態に係る内燃機関の吸気系構造について説明する。同一の部品には同一の符号を付してあり、それらの名称および機能も同じである。したがって、それらについての詳細な説明は繰返さない。   Hereinafter, an intake system structure of an internal combustion engine according to the present embodiment will be described based on the attached drawings. The same parts are given the same reference numerals, and their names and functions are also the same. Therefore, detailed description about them will not be repeated.

図１は、本実施形態に係る内燃機関の吸排気系を示す模式的な全体構成図である。内燃機関としてのエンジンＥは、主として、シリンダヘッド及びシリンダブロック等で構成されるエンジン本体部１０を備えている。エンジン本体部１０のシリンダブロックには、不図示のピストンを往復移動可能に収容する複数のシリンダ（以下、気筒）＃１〜＃４が設けられている。また、エンジン本体部１０のシリンダヘッドには、吸気ポート１２Ａ，Ｂ及び排気ポート１３Ａ，Ｂが形成されている。   FIG. 1 is a schematic overall configuration diagram showing an intake and exhaust system of an internal combustion engine according to the present embodiment. An engine E as an internal combustion engine mainly includes an engine main body 10 including a cylinder head, a cylinder block, and the like. The cylinder block of the engine body 10 is provided with a plurality of cylinders (hereinafter referred to as cylinders) # 1 to # 4 each accommodating a piston (not shown) so as to be capable of reciprocating. Further, intake ports 12A, B and exhaust ports 13A, B are formed in the cylinder head of the engine main body portion 10.

なお、図示例において、エンジンＥは４気筒直列エンジンとして示されているが、これには限定されず、単気筒、或いは、４気筒以外の多気筒エンジンであってもよい。また、エンジンＥは、各気筒＃１〜＃４に対して２つの吸気ポート１２Ａ，Ｂ及び２つの排気ポート１３Ａ，Ｂが設けられた４バルブエンジンとして示されているが、２バルブエンジンであってもよい。   Although the engine E is illustrated as a four-cylinder in-line engine in the illustrated example, the present invention is not limited thereto, and may be a single cylinder or a multi-cylinder engine other than four cylinders. Further, although the engine E is shown as a four-valve engine provided with two intake ports 12A, B and two exhaust ports 13A, B for each of the cylinders # 1 to # 4, it is a two-valve engine. May be

エンジン本体部１０のシリンダヘッドの吸気側には、各吸気ポート１２Ａ，Ｂに吸気（新気及び、又は新気とＥＧＲガスとの混合気）を分配する吸気マニホールド２０が取り付けられている。吸気マニホールド２０には、吸気管５０が接続されている。吸気管５０には、上流側から順に、エアクリーナ５１、過給機８０のコンプレッサ８１、インタークーラ５２、吸気スロットルバルブ５３等が設けられている。   On the intake side of the cylinder head of the engine body 10, an intake manifold 20 for distributing intake air (fresh air and a mixture of fresh air and EGR gas) to the intake ports 12A and B is attached. An intake pipe 50 is connected to the intake manifold 20. In the intake pipe 50, an air cleaner 51, a compressor 81 of a supercharger 80, an intercooler 52, an intake throttle valve 53, and the like are provided in this order from the upstream side.

エンジン本体部１０のシリンダヘッドの排気側には、各排気ポート１３Ａ，Ｂから排気を集合させる排気マニホールド６０が取り付けられている。排気マニホールド６０には、排気管６１が接続されている。排気管６１には、上流側から順に、過給機８０のタービン８２、排気浄化装置８３等が設けられている。   On the exhaust side of the cylinder head of the engine body 10, an exhaust manifold 60 for collecting exhaust from the exhaust ports 13A and 13B is attached. An exhaust pipe 61 is connected to the exhaust manifold 60. The exhaust pipe 61 is provided with a turbine 82 of the turbocharger 80, an exhaust gas purification device 83, and the like in order from the upstream side.

ＥＧＲ装置７０は、所謂高圧ＥＧＲ装置であって、タービン８２よりも上流側の排気管６１（又は、排気マニホールド６０）から分岐して吸気マニホールド２０に合流するＥＧＲ配管７１と、ＥＧＲ配管７１に設けられたＥＧＲクーラ７２と、ＥＧＲ配管７１のＥＧＲクーラ７２よりも下流側に設けられたＥＧＲバルブ７３と、逆止弁として機能するリードバルブ７４とを備えている。ＥＧＲ装置７０は、エンジンＥの運転状態に応じて、不図示のコントロールユニットによりＥＧＲバルブ７３の開閉度が制御されることにより、ＥＧＲガス量（ＥＧＲ率）が適宜に調整されるようになっている。   The EGR device 70 is a so-called high pressure EGR device, and is provided to an EGR pipe 71 and an EGR pipe 71 which are branched from the exhaust pipe 61 (or the exhaust manifold 60) upstream of the turbine 82 and merge into the intake manifold 20. The EGR cooler 72, the EGR valve 73 provided on the downstream side of the EGR cooler 72 of the EGR pipe 71, and the reed valve 74 functioning as a check valve are provided. In the EGR device 70, the degree of opening and closing of the EGR valve 73 is controlled by a control unit (not shown) according to the operating state of the engine E, whereby the amount of EGR gas (EGR rate) is appropriately adjusted. There is.

次に、図２に基づいて、本実施形態に係る吸気系構造の要部である吸気マニホールドの詳細について説明する。   Next, details of the intake manifold, which is a main part of the intake system structure according to the present embodiment, will be described based on FIG.

図２に示すように、吸気マニホールド２０は、上流側から順に、吸気管５０（又は、不図示の吸気スロットルバルブユニット）の出口部が接続された新気入口部２１と、ＥＧＲ配管７１の出口部が合流するＥＧＲ還流部２２と、新気とＥＧＲガスとを混合させる吸気混合部２３と、吸気混合部２３を通過した吸気（新気とＥＧＲガスとの混合気）を折り返す吸気折り返し部２４と、吸気折り返し部２４にて折り返された吸気を各気筒＃１〜＃４に分配する吸気分配部２５と、吸気分配部２５にて分配された吸気を各吸気ポート１６Ａ，Ｂに供給する第１〜第４供給管部３０，３５，４０，４５とを一体に備えている。   As shown in FIG. 2, in the intake manifold 20, in order from the upstream side, a fresh air inlet 21 to which the outlet of the intake pipe 50 (or an intake throttle valve unit not shown) is connected, and an outlet of the EGR pipe 71 The intake air return portion 24 which folds back the intake air (the mixture of fresh air and EGR gas) which has passed through the intake air mixing portion 23 and the intake air mixing portion 23 which mixes fresh air and EGR gas. And the intake distribution unit 25 that distributes the intake air folded back at the intake return unit 24 to the cylinders # 1 to # 4, and the intake air distributed by the intake distribution unit 25 to the intake ports 16A and B. The first to fourth supply pipes 30, 35, 40, 45 are integrally provided.

第１〜第４供給管部３０，３５，４０，４５は、上流側から順に、吸気分配部２５内に臨んで開口する第１〜第４吸気導入部３１，３６，４１，４６と、第１〜第４吸気導入部３１，３６，４１，４６から二股に分岐形成されて各吸気ポート１６Ａ，Ｂにそれぞれ接続された接続管部３２，３７，４２，４７とを備えている。第１〜第４吸気導入部３１，３６，４１，４６には、燃料（本実施形態では、例えば天然ガス）を噴射して吸気と予混合させる第１〜第４インジェクタ３８，３９，４８，４９がそれぞれ設けられている。   The first to fourth intake pipe sections 30, 35, 40, 45 are sequentially opened from the upstream side into first to fourth intake air introduction sections 31, 36, 41, 46 facing the inside of the intake distribution section 25, and The first to fourth intake air introducing portions 31, 36, 41, 46 are bifurcated and provided with connecting pipe portions 32, 37, 42, 47 respectively connected to the respective intake ports 16A, B. First to fourth injectors 38, 39, 48, which inject fuel (in the present embodiment, for example, natural gas, for example) into the first to fourth intake air introduction portions 31, 36, 41, 46 and premix them with intake air. 49 are provided respectively.

新気入口部２１は、上面視において、吸気分配部２５の第１吸気導入部３１と第２吸気導入部３６との略中間位置に対応する部位の外壁から反シリンダヘッドＣＨ側に所定量ほど離間した位置に配設されている。新気入口部２１の下流端には、ＥＧＲ還流部２２の上流端が一体的に結合されている。   The fresh air inlet portion 21 has a predetermined amount from the outer wall of a portion corresponding to a substantially intermediate position between the first intake air introduction portion 31 and the second intake air introduction portion 36 of the intake air distribution portion 25 in the top view. It is disposed at a spaced position. The upstream end of the EGR recirculation unit 22 is integrally coupled to the downstream end of the fresh air inlet unit 21.

ＥＧＲ還流部２２は、上面視において、新気入口部２１の下流端から、吸気分配部２５の第２吸気導入部３６と第３吸気導入部４１との略中間位置に対応する部位の外壁に向かって斜めに延設されている。ＥＧＲ還流部２２の下流端には、吸気混合部２３の上流端が一体的に結合されている。すなわち、ＥＧＲ還流部２２内に流れ込んだＥＧＲガスが、新気入口部２１から流入する新気と共に、吸気混合部２３に導入されるようになっている。なお、ＥＧＲ還流部２２の形状は、図示例の形状に限定されず、新気入口部２１やＥＧＲ配管７１の配置又は形状等に応じて適宜に変形することができる。   The EGR recirculation portion 22 is provided on the outer wall of a portion corresponding to a substantially intermediate position between the second intake air introduction portion 36 and the third intake air introduction portion 41 of the intake distribution portion 25 from the downstream end of the fresh air inlet 21 in top view. It is extended diagonally. The upstream end of the intake air mixing unit 23 is integrally coupled to the downstream end of the EGR recirculation unit 22. That is, the EGR gas flowing into the EGR recirculation unit 22 is introduced into the intake air mixing unit 23 together with the fresh air flowing from the fresh air inlet 21. In addition, the shape of the EGR recirculation | reflux part 22 is not limited to the shape of the example of illustration, According to arrangement | positioning or the shape of the fresh air inlet part 21 or the EGR piping 71, etc., it can deform | transform suitably.

吸気混合部２３は、上面視において、気筒配列方向と略平行に延びると共に、吸気分配部２５に隣接して設けられている。吸気混合部２３の下流端には、吸気折り返し部２４の上流端が一体的に結合されている。本実施形態において、吸気混合部２３と吸気分配部２５との境界部位には、これらの空間を仕切る仕切壁２８が、吸気混合部２３の上流端から下流端の全長に亘って設けられている。吸気混合部２３及び、仕切壁２８の気筒配列方向（長手方向）の長さＬは、好ましくは、その下流端２９が、吸気混合部２３内の吸気流れ方向Ｘに対して、吸気分配部２５内に臨む第４吸気導入部４６の開口部４６Ａよりも下流側に位置する長さとなるように設定されている。   The intake mixing portion 23 extends substantially in parallel with the cylinder arrangement direction in top view, and is provided adjacent to the intake distribution portion 25. At the downstream end of the intake air mixing portion 23, the upstream end of the intake air folded portion 24 is integrally coupled. In the present embodiment, at the boundary between the intake mixing unit 23 and the intake distribution unit 25, a partition wall 28 for dividing these spaces is provided over the entire length from the upstream end to the downstream end of the intake mixing unit 23. . Preferably, the downstream end 29 of the intake mixer 23 and the partition wall 28 in the cylinder arrangement direction (longitudinal direction) of the cylinder arrangement direction (longitudinal direction) is the intake distributor 25 with respect to the intake flow direction X in the intake mixer 23. It is set to have a length located downstream of the opening 46A of the fourth intake air inlet 46 facing the inside.

このように、仕切壁２８を設けることにより、新気入口部２１からＥＧＲ還流部２２を介して吸気混合部２３に流れ込む新気と、ＥＧＲ還流部２２から吸気混合部２３に流れ込むＥＧＲガスとが、吸気混合部２３内を仕切壁２８に沿って流れる間に効果的に混合されるようになる。また、仕切壁２８の下流端２９を第４吸気導入部４６の開口部４６Ａよりも吸気流れ方向Ｘの下流側に位置させることで、吸気が吸気折り返し部２４を通過することなく第４吸気導入部４６に直接的、且つ、集中的に流れ込むことを効果的に防止できるようになっている。   Thus, by providing the partition wall 28, fresh air flowing from the fresh air inlet 21 into the intake mixing unit 23 through the EGR recirculation unit 22 and EGR gas flowing from the EGR recirculation unit 22 into the intake mixing unit 23 are While being flowed along the partition wall 28 in the intake air mixing portion 23, the mixing is effectively performed. Further, by positioning the downstream end 29 of the partition wall 28 downstream of the opening 46A of the fourth intake air introduction portion 46 in the intake flow direction X, the intake does not pass through the intake air return portion 24 and the fourth intake air introduction Direct and concentrated flow into the portion 46 can be effectively prevented.

吸気折り返し部２４は、上流側から順に、第１湾曲部２４Ａと、第２湾曲部２４Ｂと、直線状部２４Ｃとを備えている。   The intake air-folded portion 24 includes a first curved portion 24A, a second curved portion 24B, and a linear portion 24C in this order from the upstream side.

第１湾曲部２４Ａは、上面視において、その外壁が吸気混合部２３の下流端外壁からシリンダヘッドＣＨ側に向けて半円弧状に延びる湾曲状に形成されている。すなわち、吸気混合部２３から吸気折り返し部２４内に流入した吸気が、第１湾曲部２４Ａの内壁面に沿って流されることにより、吸気の流れをシリンダヘッドＣＨ側に確実に指向させつつ、新気とＥＧＲガスとの混合がさらに促進されるようになっている。   The first curved portion 24A is formed in a curved shape whose outer wall extends from the downstream end outer wall of the intake air mixing portion 23 toward the cylinder head CH in a semicircular arc shape in top view. That is, the intake air flowing from the intake mixing section 23 into the intake turn back section 24 flows along the inner wall surface of the first curved section 24A, thereby reliably directing the flow of intake air toward the cylinder head CH side. The mixing of air and EGR gas is further promoted.

第２湾曲部２４Ｂは、上面視において、その外壁が第１湾曲部２４Ａの下流端外壁からシリンダヘッドＣＨに向かって延びると共に、吸気分配部２５よりもシリンダヘッドＣＨ側に円弧状に凸となるように湾曲して形成されている。すなわち、第２湾曲部２４Ｂの内壁面に沿って流される吸気の少なくとも一部が、図中矢印Ｙで示すように、吸気分配部２５内をシリンダヘッドＣＨ側から次第に離反する斜め方向に向けられるようになっている。これにより、吸気折り返し部２４にて折り返された吸気が最も上流側の第４吸気導入部４６に集中的に分配されることを効果的に抑止しつつ、各気筒＃１〜＃４に分配される吸気の流量均一化が図られるようになっている。   The second curved portion 24B has an outer wall extending from the downstream end outer wall of the first curved portion 24A toward the cylinder head CH and is convex in a circular arc shape toward the cylinder head CH side from the intake distribution portion 25 in top view It is curved and formed. That is, at least a portion of the intake air flowing along the inner wall surface of the second curved portion 24B is directed in an oblique direction in which the inside of the intake distribution portion 25 gradually separates from the cylinder head CH side as shown by arrow Y in the drawing. It is supposed to be. As a result, the intake air folded back at the intake air return portion 24 is distributed to the cylinders # 1 to # 4 while effectively suppressing the concentrated distribution to the fourth intake air introduction portion 46 on the most upstream side. Uniform flow rate of the intake air.

直線状部２４Ｃは、上面視において、第２湾曲部２４Ｂの下流端から吸気分配部２５の上流端に向かって気筒配列方向に所定の長さで延設されている。このように、第２湾曲部２４Ｂの下流端と、第４吸気導入部４６の開口部４６Ａが隣接する吸気分配部２５の上流端との間に、これらの距離を確保する直線状部２４Ｃを設けることにより、第２湾曲部２４Ｂにて図中矢印Ｙ方向に向けられることなく直線状部２４Ｃに沿って流れる吸気（図中矢印Ｚ参照）が第４吸気導入部４６に集中的に流れ込むことを効果的に防止できるようになっている。   The straight portion 24C extends in the cylinder arrangement direction from the downstream end of the second curved portion 24B toward the upstream end of the intake distribution portion 25 in a predetermined length in a top view. Thus, between the downstream end of the second curved portion 24B and the upstream end of the intake air distribution unit 25 adjacent to the opening 46A of the fourth intake air introduction unit 46, the linear portion 24C securing these distances is By providing, the intake (refer to arrow Z in the figure) flowing along the linear portion 24C without being directed in the arrow Y direction in the figure at the second curved portion 24B flows into the fourth intake inlet portion 46 in a concentrated manner. Can be effectively prevented.

吸気分配部２５は、上面視において、気筒配列方向と略平行に延びると共に、その流路幅を上流側から下流側に向かうに従い狭くなるように形成されている。このように、吸気分配部２５の流路幅を次第に狭くすることで、吸気分配部２５内の下流側領域における吸気の流速低下が効果的に抑制されるようになっている。   The intake air distribution unit 25 is formed to extend substantially in parallel with the cylinder arrangement direction in a top view and to narrow the flow passage width from the upstream side toward the downstream side. As described above, by gradually narrowing the flow passage width of the intake distribution unit 25, the decrease in the flow velocity of intake air in the downstream region in the intake distribution unit 25 is effectively suppressed.

以上詳述した本実施形態によれば、ＥＧＲ還流部２２の下流端に吸気混合部２３が接続され、さらに、吸気混合部２３と吸気分配部２５との隣接部位に、これらの空間を仕切る仕切壁２８が設けられている。すなわち、新気入口部２１から流れ込む新気と、ＥＧＲ還流部２２に流れ込むＥＧＲガスとを、吸気分配部２５に直接的に流入させることなく、吸気混合部２３内に確実に流通させるようになっている。これにより、新気及びＥＧＲガスが、吸気混合部２３内の仕切壁２８に沿って流されるようになり、これら新気及びＥＧＲガスの混合を効果的に促進させることが可能になる。   According to this embodiment described in detail above, the intake mixing unit 23 is connected to the downstream end of the EGR recirculation unit 22, and a partition that divides these spaces into adjacent parts of the intake mixing unit 23 and the intake distribution unit 25. A wall 28 is provided. That is, the fresh air flowing from the fresh air inlet 21 and the EGR gas flowing into the EGR recirculation unit 22 are reliably circulated in the intake mixing unit 23 without directly flowing into the intake distribution unit 25. ing. As a result, fresh air and EGR gas are caused to flow along the partition wall 28 in the intake air mixing unit 23, and it becomes possible to effectively promote mixing of these fresh air and EGR gas.

また、吸気折り返し部２４の上流側に第１湾曲部２４Ａを設けることにより、新気とＥＧＲガスとの混合をさらに促進させつつ、吸気折り返し部２４の下流側に第２湾曲部２４Ｂを設けることにより、吸気の少なくとも一部が吸気分配部２５内をシリンダヘッドＣＨ側から次第に離反する斜め方向に向けられるようになり、吸気折り返し部２４の下流端に直線状部２４Ｃを設けることにより、第４吸気導入部４６の開口部４６Ａとの距離が確保されるようになっている。これにより、吸気折り返し部２４にて折り返された吸気が最も上流側の第４吸気導入部４６に集中的に分配されることを効果的に抑止することが可能となり、各気筒＃１〜＃４に分配される吸気の流量均一化を図ることができる。   Further, by providing the first curved portion 24A on the upstream side of the intake air return portion 24, providing the second curved portion 24B on the downstream side of the intake air return portion 24 while further promoting the mixing of the fresh air and the EGR gas. As a result, at least a portion of the intake air is directed obliquely in the intake distribution portion 25 gradually away from the cylinder head CH side, and by providing the linear portion 24C at the downstream end of the intake return portion 24, the fourth A distance between the intake air introduction portion 46 and the opening 46A is secured. As a result, it becomes possible to effectively prevent the intake air folded back at the intake air folding portion 24 from being concentrated to the fourth intake air introducing portion 46 most upstream, and each cylinder # 1 to # 4. It is possible to achieve uniform flow of intake air distributed to the

なお、本発明は、上述の実施形態に限定されるものではなく、本発明の趣旨を逸脱しない範囲で、適宜変形して実施することが可能である。   The present invention is not limited to the embodiments described above, and can be appropriately modified and implemented without departing from the spirit of the present invention.

例えば、本実施形態の吸気系構造は、新気入口部２１、ＥＧＲ還流部２２、吸気混合部２３、吸気折り返し部２４、吸気分配部２５及び、第１〜第４供給管部３０，３５，４０，４５が一体に形成された吸気マニホールド２０として説明したが、これらの一部を吸気マニホールド２０とは別体に形成して構成することもできる。   For example, the intake system structure of the present embodiment includes the fresh air inlet 21, the EGR recirculation unit 22, the intake mixing unit 23, the intake folding unit 24, the intake distribution unit 25, and the first to fourth supply pipes 30, 35, Although the intake manifold 20 has been described as integrally formed 40 and 45, a part of these may be formed separately from the intake manifold 20.

また、エンジンＥは、燃料に天然ガスを用いるものとして説明したが、これには限定されず、ガソリンエンジンやディーゼルエンジン等の他の内燃機関にも広く適用することが可能である。   Further, although the engine E has been described as using natural gas as the fuel, the invention is not limited thereto, and can be widely applied to other internal combustion engines such as a gasoline engine and a diesel engine.

Ｅ エンジン
ＣＨ シリンダヘッド
１０ エンジン本体部
２０ 吸気マニホールド
２１ 新気入口部
２２ ＥＧＲ還流部
２３ 吸気混合部
２４ 吸気折り返し部
２４Ａ 第１湾曲部
２４Ｂ 第２湾曲部
２４Ｃ 直線状部
２５ 吸気分配部
２８ 仕切壁
５０ 吸気管
７１ ＥＧＲ配管 E Engine CH Cylinder Head 10 Engine Body 20 Engine Intake Manifold 21 Fresh Air Inlet 22 EGR Reflow Unit 23 Intake Mixing Unit 24 Intake Inverted Portion 24A First Curved Section 24B Second Curved Section 24C Straight Section 25 Intake Distribution Section 28 Partition Wall 50 intake pipe 71 EGR piping

Claims (5)

内燃機関の排気系から還流される再循環排気を導入する再循環排気還流部と、
前記再循環排気還流部の下流端から延びると共に、新気と前記再循環排気とを混合させる吸気混合部と、
少なくともその一部を前記吸気混合部に隣接させると共に、前記吸気混合部にて混合された吸気を前記内燃機関のシリンダヘッドに形成された吸気ポートに分配する吸気分配部と、
前記吸気混合部と前記吸気分配部との隣接部位に延設されて、前記吸気混合部と前記吸気分配部とを仕切る仕切壁部と、を備える
ことを特徴とする内燃機関の吸気系構造。 A recirculated exhaust gas recirculation unit for introducing a recirculated exhaust gas recirculated from the exhaust system of the internal combustion engine;
An intake mixing unit extending from the downstream end of the recirculation exhaust gas recirculation unit and mixing fresh air with the recirculation exhaust gas;
An intake distribution unit for making at least a part thereof adjacent to the intake mixing unit and distributing the intake air mixed in the intake mixing unit to an intake port formed in a cylinder head of the internal combustion engine;
An intake system structure of an internal combustion engine, comprising: a partition wall portion extended to an adjacent portion between the intake air mixing portion and the intake air distribution portion to separate the intake air mixing portion and the intake air distribution portion. 前記吸気混合部の下流端と前記吸気分配部の上流端とを接続して前記吸気混合部から流れ込む吸気を前記吸気分配部に向けて折り返す吸気折り返し部をさらに備える
請求項１に記載の内燃機関の吸気系構造。 The internal combustion engine according to claim 1, further comprising an intake air return portion connecting the downstream end of the intake air mixing portion and the upstream end of the intake air distribution portion and turning back the intake air flowing from the intake air mixing portion toward the intake air distribution portion. Intake system structure. 前記再循環排気還流部、前記吸気混合部、前記吸気分配部、前記仕切壁部及び、前記吸気折り返し部が一体に形成された吸気マニホールドである
請求項２に記載の内燃機関の吸気系構造。 The intake system structure of an internal combustion engine according to claim 2, wherein the recirculation exhaust gas recirculation unit, the intake mixing unit, the intake distribution unit, the partition wall portion, and the intake return portion are integrally formed. 前記吸気折り返し部の下流端側に、前記吸気分配部よりも前記シリンダヘッド側に円弧状に凸となるように湾曲する湾曲部が設けられた
請求項２又は３に記載の内燃機関の吸気系構造。 The intake system of an internal combustion engine according to claim 2 or 3, wherein on the downstream end side of the intake air return portion, a curved portion which is curved so as to be arcuately convex closer to the cylinder head than the intake distribution portion. Construction. 前記吸気折り返し部の前記湾曲部よりも下流側に、前記湾曲部と前記吸気分配部の上流端との間に所定の距離を確保する直線状部が設けられた
請求項４に記載の内燃機関の吸気系構造。 The internal combustion engine according to claim 4, wherein a linear portion for securing a predetermined distance between the curved portion and the upstream end of the intake distribution portion is provided on the downstream side of the curved portion of the intake turnaround portion. Intake system structure.
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